Exercise device



FIG. 1 is a top perspective view of an exercise device showing our new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a front view thereof; and,

FIG. 6 is a side view thereof. 

CLAIM The ornamental design for an exercise device, as shown. 